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authorIngo Molnar <mingo@kernel.org>2019-11-29 10:17:25 +0300
committerIngo Molnar <mingo@kernel.org>2019-12-10 12:12:55 +0300
commit186525bd6b83efc592672e2d6185e4d7c810d2b4 (patch)
tree0fd5cb176e8e113a552730ea07dedbb8359e652b /mm
parent1f059dfdf5d170dccbac92193be2fee3c1763384 (diff)
downloadlinux-186525bd6b83efc592672e2d6185e4d7c810d2b4.tar.xz
mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions
- Untangle the somewhat incestous way of how VMALLOC_START is used all across the kernel, but is, on x86, defined deep inside one of the lowest level page table headers. It doesn't help that vmalloc.h only includes a single asm header: #include <asm/page.h> /* pgprot_t */ So there was no existing cross-arch way to decouple address layout definitions from page.h details. I used this: #ifndef VMALLOC_START # include <asm/vmalloc.h> #endif This way every architecture that wants to simplify page.h can do so. - Also on x86 we had a couple of LDT related inline functions that used the late-stage address space layout positions - but these could be uninlined without real trouble - the end result is cleaner this way as well. Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Rik van Riel <riel@redhat.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/highmem.c2
-rw-r--r--mm/vmalloc.c8
2 files changed, 9 insertions, 1 deletions
diff --git a/mm/highmem.c b/mm/highmem.c
index 107b10f9878e..64d8dea47dd1 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -29,7 +29,7 @@
#include <linux/highmem.h>
#include <linux/kgdb.h>
#include <asm/tlbflush.h>
-
+#include <linux/vmalloc.h>
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
DEFINE_PER_CPU(int, __kmap_atomic_idx);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 4d3b3d60d893..19cdbb11fe07 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -41,6 +41,14 @@
#include "internal.h"
+bool is_vmalloc_addr(const void *x)
+{
+ unsigned long addr = (unsigned long)x;
+
+ return addr >= VMALLOC_START && addr < VMALLOC_END;
+}
+EXPORT_SYMBOL(is_vmalloc_addr);
+
struct vfree_deferred {
struct llist_head list;
struct work_struct wq;